I purchased this 6300 btu on 9/19/12, fourteen months later it started rattling and getting louder. Service has none nothing to fix. Now the AC is dead, and no air comes out. I'm still waiting to hear from PC Richards for a credit. Very disappointed and hot.

I bought the Sharp because the previous unit that I owned (a Frigidaire) sounded like a jet engine and I couldn't sleep. My mother has a Sharp 8000 btu in her living room window, and it's so much quieter! Well, maybe it's because mine is in a bedroom, which is also a smaller room than her LR. My Sharp 6300 btu seems to not be quite as quiet as hers. Although it wakes me up when it cycles on and off, it's still better to sleep with than the Frigidaire. And, yes, it cools the room very well.

I have LR and adjacent small BR and this a/c cools both rooms well. It's not quite at all, at least in the general understanding since I haven't had window a/c before and have nothing to compare with. I wouldn't be able to sleep with it if it was directly in my bedroom

I just bought four of these air conditioners 6300 btu's and read the previous review. It is not as quiet as you might think. All four of them make a weird sound on the inside. It happens for awhile then it stops.I only have them on low, couldn't imagine what high would sound like. Really thought I found a winner but disappointed. What ever happened to the Emerson Quiet Cool. Now THAT was a quiet air conditioner!

I had a different air conditioner in my bedroom and it was just too loud. I looked online for quiet units and found this one. I just picked it up and I'm now laying comfortably in my quiet bedroom writing this review.